Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '426fde08f9cd922f7eaf045409564a155a0e47cc5d458ca8bc9fd1c6167801af' 
  AND token = 'Ch1kKXAbQ0T0Oz1HfObojKlQ0vCQXsLEIFU0to0ytdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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