Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3f916c690d5ba32293c5ab725c3889af9986810c701a80a981637881d1ed364' 
  AND token = 'BEgs4E+EnFKOWQM/ek/2+nL9Ag/kn10/XkxYUgkdshc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}