Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a00806cbaf0a5e6327996852d925777de893c2a8ddfd246ad3ee83d88d24a7dd' 
  AND token = 'Op6ZkPFlgWOulGWd/T5iJ4h3j7r5ljrwiQEK2JrGe6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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