Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f32252189e7def939c8064320a98261cca82bf952642161108399e71e79beae' 
  AND token = 'MujxrHGTThNVe+NOsGjyZ/gXNjeFexxlVUedUookP2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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