Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '048b703bd23925573eecbb0886a95736c4ae90d52351687e448e4e1b98b68252' 
  AND token = 'AfI98cRGkt9AHuccOQiGzjdXHivScKVoLxf5f3mV29k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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