Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b19d0d1a17f7fa33ec430dcd86d89bd5cd6862873d1cd0dbca9d9f017bfd835a' 
  AND token = 'i66X6jbWbsqum4qC4u99fTj5PIfXuhSlXt68wAd3U1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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