Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9e364f2766e10ca4499bc7e1987f407692a03a77de416b88017e409116899c4' 
  AND token = '5iAgNIc5aQ9MrRMmHYBjCZT+VP3UAnUpXo33C7fEk8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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