Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b5abfca466a12a849a9d0bd481544fceccb2cbbf517c062ad3b01a32d1aa217' 
  AND token = 'zG6A6zQb2dWlFj3Q2rDc3UJlTRTRCHKqaD6fD+1N6NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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