Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff94f4ef8e13d8f0e724b74861eea7dd31a177a819f1a4ef1f03c2d6067e906b' 
  AND token = '9BnHuekUAREUCJC/tV74n582Jaiit8oZnBKCi0vPFg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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