Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd868b5c1c1a103f28f01f55ffc48811f7f1acb32f366b2ff7b34b91c52707429' 
  AND token = 'F5YAGSecYLdVzCIph+y9gsp7C6nauDS3E8/3A2QwV9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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