Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4715abd505ac9961ac8441e24ce102f2b7710f5d06fef152b228e0ae0b5d950' 
  AND token = 'zY9wePf9ZiXEtbjDKTRKQPEWfjFJ9gvR9rr0pvIBOyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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