Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2df850760381b3da6f8d27b4a04538e0520d8061239705155cb0d75678b107fc' 
  AND token = 'daC3enkY+7BLn7YOcS7s3hkkGwl5xBHaqN+8CXQsMOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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