Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7079ec0e8f7b71352e11e424b0ef77c4b0f906e713c96794cbee5b56eb145d10' 
  AND token = 'iJM3lOfML8z8UEEjUXClZ3C5LwaqCoQ3TIoGPIyHphA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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