Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c4dcf834a767c13bcbcfee96107b161241986dc84d9210ae9c4a121bc620236' 
  AND token = 'oxGmMGhhYha6KhuxuwrUK2rq6jlIPEJ5wr/wNcXIV3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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