Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d0934643613e8e23163fc5cd7621fd2b420f80e386ade7414224588e4255376' 
  AND token = '2EozWBg1QWugTcpdoh1znjxNeW27JcYfoRmEuYGS8JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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