Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc1254833cf0e320af292f71c42a635a90eb56c4418b4048b0b0ae2dc92931d9' 
  AND token = '3pWxPMA798UQvMpWugDIIfVqdJh9p894t42cvrCkX3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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