Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409dc183d477b35cd6d07bfd1f508f5bbea5b6782981c6b87bcfee599a14f234' 
  AND token = 'GNP8WTzfO0rc8Tcc2KOJZRj5ktnXMWSPQv/s+aAxso8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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