Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe78bad50fd130faefb1efb4bba6e826d268703ffef9d98b1123a05046ad7c00' 
  AND token = 'ri5+cHExguGOxcxUHZH3tZymZbTNGMR7L865a+Zs13M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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