Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92360eeda03e3f921d085260cde1ad383ee8b7c63d926b6e2fdc2af1c398a0f5' 
  AND token = 'W9SQnJOv8GpyNTAtxEoTXdFxLEaSpdTjpr5d/UIJx4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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