Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f20e9e27a03b65a9daffa8567e422ee7feed03fb6c196b5faa06d8833feef28' 
  AND token = 'h+BzxdWv6LdMjDqZk1tXUTVFGIyIv2ZqnIIf2XfH/Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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