I don't like fast defrosting, full stop. Microwave or hot water, it's still hard to tell if the internals are all fully defrosted - or cooked.
I don't like microwaved food myself, it never tastes right, so I'd never feed my snakes microwaved stuff. Was warned off it from day 1 by the place I bought my first ever snake from anyway ....
I let mine thaw out in the fridge overnight (on a plate - which only gets used for mice I hasten to add! - and bagged). Next day I take the plate out of the bag and sit it in the airing cupboard (with our hot water tank in it) to warm them up and then feed.
Never have any bother ....
Only used the hot water technique to raise the body temp of pinkies to try and get problem feeder hatchlings started. Can't say it ever seemed to help much. When something is that small, it's not going to hold any additional heat you give artificially for very long.