Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a764f64a756c92aa2cff4bfe3f2ead969b4ece60682ddc305fe48b26ffbed3a' 
  AND token = '4iZ4ZTgAwKR7YK/xY4E/eVoKXEM8SbKaT+jE7RTK6N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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