Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f75c592bcccc8d696f5169cf02bc72cbed0942f0bc5dddeed3cd414bb52939a5' 
  AND token = 'nQoFJy+cx6N61qLg93tiwZQwf/tfobebBkdIrofFS5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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