Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f147b8121fd25c200db338fd2d1a80b225a7b4ef4c3b1439b2db37af53423e3d' 
  AND token = '7u96ezslVc7tGpzow5OOQWXix1KIT83JfP726KWM/UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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