Do you have a screen top? If you do i recommend going to home depot or lowes and getting some Plexiglas to cover it... about 80% of the top probably... also make sure you have a water bowl... and some type of good water holding substrate... cypress mulch works well. Also avoid running high wattage lighting for a long period of time as this sucks out a lot of humidity... you should have a 10-12 hour day cycle. If you do this then you shouldnt have to mist it but maybe a couple times a day to get the required 65% humidity for your snake... you got it easy... try a brazilian rainbow boa or other snake that needs 75%-80% humidity.
-Brant