Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe6a308d28515720fc4e1fcb14f7b8f2833f7005a51c9c29da0b72b80077ad02' 
  AND token = '5CY4AOCXXeg6LcxG5k+2E+uuQhead5M4A22VgcEXDOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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