Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8bbad2f37dc4bc341780395f529fb18eea215c4e50d804847909ab76269660' 
  AND token = 'xuqUJKx8oLDykq15pAo579BcDgDeU7jD8eEUEKz9GXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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