Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac3805505783c09a786540c87ce2b52fc504820862a00a14e27a8f7ad0c4b86' 
  AND token = '6LyB1HcPKXIQy6GchNlJYTb0k2huL+qoHWT1xYihP1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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