Certainly the transcendental body of Sri Krishna is not perishable. He is just like the sun, and maya is like a cloud. In the material world we can see that there is the sun and that there are clouds and different stars and planets. The clouds may cover all these in the sky temporarily, but this covering is only apparent to our limited vision. The sun, moon and stars are not actually covered. Similarly, maya cannot cover the Supreme Lord. By His internal potency He is not manifest to the less intelligent class of men.