Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '23358960e6bff7427f48f19be96be1dd574f2bda429639d682732757f5c52449' 
  AND token = '19hDbW+rH+JDX2iiItjSd8VZF5S5+qS04zLV3Ow4TiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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