Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2f753c73fed63ec5c1d6677b59bb2987fcd0287da14ca587b7bbd2463457c47' 
  AND token = 'kVE9DuO7ckb0OyyhhJQrbeUGiwxTfLgbOHXTW+ZHsCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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