Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d9176d70e65b628dbc828b9060bd14f32064aa99a35145b83a1c7710fda96d' 
  AND token = '7EWpfYkYENJfImGbJNepB96OT6Xcb2Ih4AEj2szdTXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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