Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acef78063c893ab707449669e711473e9fb6825d4a350d2ab66f5a14c0c4b14b' 
  AND token = 'D59mxtc+NtN9g1sh84AHTcpMoKZBBYDlnCTbArkWpWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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