Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91876a4156ec48b7608f0e1fca586fc368f2dd9338236eba38e0f09dbeec62ab' 
  AND token = 'QwGGtb5WitxHpbiXtrZrhf8OzXXWcf8+sIj3qQ71ZgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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