Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b642405697e900ccc23adee350abedb7b1a20524fe10a3bc719a30424c49719f' 
  AND token = 'kTeUJQ4x/iy9Q5TLOagPrNcCHcVfJSAs77AoapOXA8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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