Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7822926ce6fed82bd2808719142b5395d35b8bebafc4921b758a0eba865ce2a' 
  AND token = 'yVQLJ9s1z5voLLV3bsBOXeSNgiLLtX+h8S/vwH1WlMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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