Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31eddcc9e72e25834ea39456099bb8ccdb3445410f18f1d7af50cd2138072481' 
  AND token = '9kBA4EYlLyhtch7ChDPU0BQj5Ix91kah+rP1C5gdniI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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