Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a34378cfe6f6853d15b97798fcbe07873093d06e59ec8fde51b6c5b9e5ea14cf' 
  AND token = 'GxXF+OwXT1o3UiTqBcLr49u/3lTTwMy7hleqD7faze8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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