Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '242d4021f61cfbd83c76143aeaeca39461e2ae482b92c2c1aa427684caa67276' 
  AND token = 'x8PZJjRCy9kvlEDEQi9lM1GD2t9cB2eggytTsev4QEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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