Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9febc7e0b4f3ad1ac9f151e9c4f699ceb7ab67825377c411879b87b442ea18c' 
  AND token = 'A6WrY086CRS8SXcdSYv1gRWS7uYRQJuR0VwFm1MsDT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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