Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e13826e0c6bbb035921fb8d491acf0485a4dda73a955cc92b9495650cb278b' 
  AND token = 'OLWJNPjyb6Jb0suqbD7jFFrYhn72cNUnlnAIHZH+Ygs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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