Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a90344ca625d4fc35d2139b64a261c780509aa42e2a07e501688ec0cd85bf726' 
  AND token = '6dFLAVyPM9tTM0dEH9gEaJsDd5b3teclsCdfXOwxw14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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