Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b2802a7a427723f09a6dbeb2e7cdfd6edbc5dbbfd090d2bc464edeeebcbae56' 
  AND token = 'SPbJIChP9T237/lOAyZ3g9qudW0ZrQ7dLCPt/R5DWmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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