Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c792425b5ee099662fb84078ddf56440e93f77e1bea3147fbb809d8c2007b53' 
  AND token = 'jgxUSUKtCNvEFEJiXrnyabbQkBLeALEwziDcfACYm3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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