Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '566a8208ebcef3eebe9e987cd648aea9e7e502b4dfbf3bdda8e13bbee1f6ad50' 
  AND token = 'ChHSRUBI7wOvS+k5hEivYVj+naw1uPkVBPvzvVLt8zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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