Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56f5b82cb482061021a1bf01530ff51fd5258003eabee476904c39d954f2249' 
  AND token = 'NGZBrrONUZFTRW5oHVq0IckCVFOxslJVcUf61XVR7Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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