Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4350dea593e646645063e71e87c4f470f7753a335417a677333d6cc4c00451ab' 
  AND token = 'PHpnULuNthi/YQj/q+RsfsI8HPByVNzr/DDVf3RIrrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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