Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e92d29e81499829d753f3555bc4c71dcb981ae5b9b91c7192fd4b0ac36293b5' 
  AND token = 'fvObsD9uARW8gUMQe7JN8n009fXaZCYyI+mhLsAWzIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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