Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc308ef485f756097eedc314cc2ea01ac2d70baaa365c297bc5076be7261b72' 
  AND token = '+8gIYERy7/+uCu5FO5/x6vSKUgbMNCWEk2KxVEWpwtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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