Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba6e6c389ca55c68dd65ec8ff39d3b402c6f6438266e8012132b67731f275bc' 
  AND token = '/KnWdQrsgu7XMjVYj6gvoA4r2ZEOtIs6RnVqdu7HxQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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