Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f8d0a6da61054a16e2dcce80e217066b79c2e5f3f0cea9c587532ad65afc8f' 
  AND token = '9h9Tj7T31F8hsRi4e0ySD3XJ5FohmCOFwKT7+Ya5L18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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