Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dffaa55219a4b8a51a921510fbdf4d366ec95e95af14fc4eefc05bad9ccbbf7f' 
  AND token = '6iitoQXirZpAdDKva3qof0CppfhBdeEBNw9fllVrBhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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