Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e731ef281354e5cba1638b981d85970c5f121cc9959b6519d09ebaf3ad1db1d' 
  AND token = 'd6vd+7vMJ950BDs/BnUK6Px2l5V+F27tAEVVsk8R1JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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