Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9359c766a388c9dffa423ae48d77eda68727ec191c134e7061a40bc25821f65' 
  AND token = '2mBd3QfIEHfPqhnwrEkuf+TKHqVIBpFMI2NLFMl56Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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