Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '766281360a5161993adbb8f2fc2bb71e7e5c12b62a5a91e3f815403fabaa1226' 
  AND token = '4MpiXWcCFVNpRlhIXHeSdSc4orJiKxTuMrTVXnIbyug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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