Dear Paolo,
 
  Albeit short and less descriptive than we would wish, the three 3rd-4th Century Gāndhārī documents from Niya that mention the persecution and summary execution of witches, numbers 58, 63, and 248, are the one instance I can think of (you will find the texts in Boyer, A.M., E. J. Rapson, E. Senart, and P. S. Noble, 1920–29, Kharoṣṭhī Inscriptions Discovered by Sir Aurel Stein in Chinese Turkestan (Oxford: Clarendon Press), and Thomas Burrow's English translation in his 1940 A Translation of the Kharoṣṭhi Documents from Chinese Turkestan (James G. Forlong Fund. London: The Royal Asiatic Society), available online at https://depts.washington.edu/silkroad/texts/niyadocts.html).
  The tricky part here is to what extent one can consider Central Asian Shanshan/Nuava to be Indic/South Asian. My own take here—but there is a variety of opinion—is that it was a settler-colonial society in which Gandhāran culture informed the discourse of a mestizo elite, à la Latin America.

  The term khakhorda or khakhorna used for "witch" is particularly fascinating with its presumed Iranian etymology (~Avestan ka-xvarəδa). Given that the indigenous people of the kingdom were probably Iranian speakers, it is likely that the "witchcraft" reflected indigenous practices. I look forward to seeing if other people have more references.

  namaskaromi,
 
  Diego