Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '042091d06338c3755ad56697d1149309e2d9a378be106d65b7d83c5f8e35f7b9' 
  AND token = 'f9lKu6tVHttDpetnH/3AEzBC7eM/+UepswTNIQ1rosk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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