Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a783be4dd16755853e61ac75fa02665c2e7c2ad2be6765bd0a634074b656e26f' 
  AND token = 'MQ01IzrcU7HOJfB6AycT8MhsCLj/VKXZC0MnUsbwu8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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