Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c30cb96011975e9996a78de79b85e7755833cd66818103119475daff993f14' 
  AND token = 'IBUwoIqF7pQJ6xfrV62N4EqkzyNg16MEv2k4K7Raxfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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