Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d652dd4c9a700e5bb9c071dc2b8898f21aad0ffe7197e654da11f0f5f7fc8fb' 
  AND token = 'ozwdjgr317YksfwBGw4RuIGW2mdn3zrS2YKmMsznwP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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