Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c75afa668eb08f843ac560c6dcb5a19852acd3c6dafd23562a654767a4d57bf' 
  AND token = '+oxRqzdbkMhOs/mTCfEixO3flNI5PPNj3mxaL/sej4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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