Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8346caa666a8551fce7fb16ad45f1bb0f0ab61c912a804dc5012e39fd89ec81' 
  AND token = '/glON7pSJACMKhfcoQnXx5Uhk6FosqmMRcnFjuFmhlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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