Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96315e11e95b6d3bdbcc2a0056cf0a3dc81c2bc0cc586617b276228daa516cc3' 
  AND token = 'MqkoxzVV6TgSvK4odnVrFQpvnDCoJvc5RFTClG9y5gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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