Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79da042387e846a0435f137923e07586f757135c9eebc86ca5048661a5a8765' 
  AND token = 'EtY/QlR2J3yhISYw+fz4teGyJh6iYxnFiEZYrUsk98Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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