Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d5aee7ddf08255ccc4a01a2a7714aad00dc6f5954ceaa3ceabedd833187ddcc' 
  AND token = 'DyUTTEfV/Qb5+7fsPlHa6ThlGAM73UWhBlUrEuw9jdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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