Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ccf3ef3de0b650611beafdc913b544d401d51c2ccc079fa9ad95d91d0c8d11f' 
  AND token = '7uU3ekdyusTjdm5ZpOUZrUWU+vSQZBnPOx5jExaH1ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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