Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b39cbe39ebbdfa590f3453603f47fdf36c45198b340cd8d0d347f95f9f7b7d90' 
  AND token = 'huC7rlFIHbTZMG57jbQKQ4xajQeWsPNkddO19eQ9K5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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