Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d9550d50725e9483d41e2851520f1e5840764465335aa17c3decdec9bc6f03' 
  AND token = 'HfGQQitA0ZsGYE6USjlCa5gaKNftrbqNjk/ejDNg4NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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