Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d4bef66f7fe00ccbf3622b482f9c9ec28d72c3951dc5c5fce54f16c87633fa' 
  AND token = 'K4WoHMs4XLoD4ozEdC03/90iKx5oP/S9tXYDs4kg5Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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