Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b33928517e9cec66597f19c9f1f81967c9c2f8ffb1ccc992a33759d1f57d4f12' 
  AND token = 'iTaEpFlIYznnGcven6KrXV2Vzb+Fkr5ig5GDulfYN8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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