Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84389e4e44e351188b33f7c6251e4b1813ebf5d07ad3b73aa0b92ba7b14d908' 
  AND token = 'WQBCn83QQxiwZbi74B8Q5nCx06UyK9cx1tZaVzzqQrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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