Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d37e8deeee9eb75903065e6c73dbd5afa191371807ed4daebe74ec7b6c71a93' 
  AND token = '0NfFcpZr9EIUqz8Rjr5WqRtJu+cEX0KHCMQXI4S/z8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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