Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6dfa43d93bd1ff684e15edc8b5ea9be2792e134fd3e65710ca7ca994ca0787b' 
  AND token = 'cTgFl7AX4eiqWuOjYcY9bMwpEZsGn4/skUCO+cOxE38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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