Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '000ced6251f1d6047a8d095cac2920d7a61c979c4952608d87c1dfc4afb0e67d' 
  AND token = '0M/94LicuErK8sS37AC/iulVmC2OtaMvTWL/iF7yRzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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