Im not too sure that spray will work well on the mites. But that stuff is non toxic to snakes so you could feed same day you treated with that stuff.
You need to buy a can of Lice bedding spray. Small can at walmart is $5, treat same way you did with the abvoe spray, but this time dont feed for few days.
The spray you bought Contains no pyrethrins, which is an ingredient needed to kill a lot of pest insects. Used correctly and its harmless