Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1806e03fdc68a05c1b75b1be39cfe2b55735d9460b8e561b1c7117cd9c2ac9e' 
  AND token = 'V+s3f6dYS6SkDlCjqoQWLaUEXL0JpCIZhci4WGYZXD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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