Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a23f50a1ea77bcc70083dd494e0e383e3a9346ec631b2bcdbf20fbb6e0fbfe3' 
  AND token = 'z4w/YdvJlujDDXGPeZX2DlIXqD+xU0GzWldm5zzxdCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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