Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3664944707022a6b32386fa970f052632eaad4f697d9c679969cca8a16030937' 
  AND token = 'eMJWkZReYxLMQrF3YkAJ6E5adjd1KFxLyrxx3hC16RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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