Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d68579a38b3b36ccba0faaa84ea55e3c25bf9a8a7d0d724358bc2167dedb23d' 
  AND token = '0YPEoCQPqm8aYzxRMRl3m5SNVjxe4zLpXaWWJbkGCUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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