Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '273d696fa8a7ff0988e687442b19a1defcc7c6b962e0bebbf1542d1cf88bc067' 
  AND token = '2896Yd6u2+7LcILf4NwIjiqomFngaiPlkz93u8eEEnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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