Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ffda6c8e7935132944665498edf000dafcdb9b2990a732ed57f9a0efd07407e' 
  AND token = 'TUxYfDqaABfGw6KGibyqxYi63LZz3XXYmWnkrVUIaQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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